Warsaw MuleSoft Meetup presentation about migration Mule 3 to Mule 4

2. Warsaw MuleSoft Meetup #5
November 13th, 2019
Mule #3 to #4
Migration Case Study

3. All contents © MuleSoft Inc.
Agenda
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• Community updates
• Migration Case Study (Mule 3 to Mule 4)
• Networking time
• Disscussions
• What’s next & Close

4. Introduction

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Our Partners
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Organizer
• Senior Integration Developer at PwC Poland
• MuleSoft Ambassador
• MuleSoft Meetup Leader for Warsaw, Poland
• Latest Salesforce Trailblazer
https://trailhead.salesforce.com/trailblazers/p
atryk-bandurski
• Integration Blog
http://ambassadorpatryk.com/blog
• Working with MuleSoft products for over 8
years now
Patryk Bandurski

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Speaker
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• Senior Integration Consultant at BlueSoft
• 6+ years in Integration as Developer,
System Analyst & Solution Architect on
multiple platforms
• Mulesoft Certified Developer – Level 1
(Mule 4)
• Mulesoft Certified Developer – Integration
& API Associate
• https://www.linkedin.com/in/krzysztof-
hałasa-279b69a4
Krzysztof Hałasa

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Share
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• Share the Meetup in your social media
• Use Hashtags
– #MuleSoftMeetup
– #WarsawMuleSoftMeetup
Thanks 

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Would you like to present some cool topic at the next Meetup?
To submit your idea, fill out this form:
https://tinyurl.com/become-speaker
Become a Speaker at the Meetup

10. Community Updates

11. MuleSoft London Connect

12. Anypoint Platform October 2019 release

13. The best place to ask questions and help others.
MuleSoft Forums

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18,000+ members ready to help.
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https://help.mulesoft.com/
• Check out the “MuleSoft
Training” category for all
training and certification-
related questions
Replaced with Help Center

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Warsaw MuleSoft Meetup Group
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• https://tinyurl.com/warsaw-group
• On MuleSoft Help center
• Why?
– Suggest topics
– Discuss event’s topics
– Discuss anything you like
– Ask questions
– See updates regarding our
group!
Register today 

16. Mule #3 to #4
Migration Case Study

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Topics to discuss today
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1. Basic differences
– Coding ’habits’
– Error handling
2. Reference elements differences
– Salesforce
– VM Queue
– Databases
– Scripts

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Sample Services Concept - 1
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HTTP
• POST #1
Salesforce
• Get data
– simple
SOQL
• Get data
– dynamic
SOQL
VM
• Salesforce
Data
• Additional
properties
Database
• Insert
salesforce
data with
properties

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Sample Services Concept - 2
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HTTP
• POST #2
Script
• Prepare
Query in
Javascript
Database
• Run
prepared
query
(select)
JSON
Response
• Present
data

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Mule 3 Mule 4
Coding ’habits’ – properties, configurations etc.
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• Anypoint Studio 6
– Both Community & Enterprise
• Manually setting-up Maven
• Property Placeholder
• Message Properties, Mule
Expression Language, DataWeave
1.0
• Anypoint Studio 7
– Only for Enterprise
– Intellij + Mule plugin for Community
• Ready-to-use Maven
• Configuration properties
• DataWeave 2.0

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Mule 3 Mule 4
Salesforce
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• Single Salesforce Block
• SOQL - Query Builder
• Multiple
Salesforce Blocks
• No SOQL - Query
Builder
– but we used
Salesforce API
and wrote a
simple http
request to
access all
column names:
salesforceObject
sDescriptionFlow

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Salesforce – code example
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Mule 3 Mule 4
Sometimes do not trust Anypoint Platform error list 

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Mule 3 Mule 4
VM Queue
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• Dynamically-set queue names
• Not possible(?) to get data from
queue on-demand
– or your speaker does not know how to do it 
• Message property
• Need to define queue names ’up-
front’ in VM properties
• Easy getting data on-demand from
queue
• No message properties (?)
– or your speaker does not know how to do it 

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Mule 3 Mule 4
VM Queue – code example
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• Multiple Database Blocks
• One Database Config Block
• DataWeave parameters in SQL Code
as prefered option
Mule 3 Mule 4
Databases
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• One Database Block
• Multiple Database Config Blocks
• #[…] working in SQL Code

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Databases – code example
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Mule 3 Mule 4

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Databases – known issues in Mule 4
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Database connections
Out-of-memory on Mule Server caused by db-connector
Database connections are not being closed after flow processing end:
https://help.mulesoft.com/s/question/0D72T000003t3JO/database-connections-are-not-closing
Database connectors are consuming a lot of memory, causing OutOfMemory exception
Solution: Use try-catch block for each database call, and configure max/min pool
size in Database Config.
Solution: Upgrade mule-db-connector from 1.4.x to 1.5.x in pom.xml

28. Lunch & Beverages
Break

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Mule 3 Mule 4
Scripts
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• Multiple blocks for scripting
– One block also available – so a bit
’messy’
• message.setInvocationProperty(..)
as a method to set any number of
variables you want in one script
• One block for scripting
• No functions to set multiple
variables
– or your speaker does not know how to do it 
– You can build your payload/variable,
so variables values can be set-up as
script-output elements, and re-write
to Mule Variable.

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Mule 3 Mule 4
Scripts – code example
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Mule 3 Mule 4
Error handling
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• * Exception Strategy
– Catch
– Choice
– Custom
– Reference
– Rollback
– Mapping
• Try-Catch block
• On Error Continue / On Error
Propagate

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Mule 3 Mule 4
Error handling – code example
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Summary
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• Mule 3 and Mule 4 has differences we cannot underrestimate during
migration project planning.
• So far – no migration tool. Each service we need to re-write code we have in
Mule 3 to be compatible with Mule 4.
• Not that hard to re-learn – useful course:
https://training.mulesoft.com/course/mulesoftu-mule443
• In my opinion, Mule 4 is more mature in concept – but has some difficulties
we need to overcome as is quite fresh platform.

34. Questions & Answers
Discussion
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35. All contents © MuleSoft Inc.
Materials
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• High-level article about Mule 4 migrations:
– https://blog.bluesoft.com/mule-4-migration/
– https://docs.mulesoft.com/mule-runtime/4.2/migration-process
• MuleSoft Documenation
– https://docs.mulesoft.com/mule-runtime/4.2/migration-core
– https://docs.mulesoft.com/mule-runtime/4.2/migration-cheat-
sheet

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Kahoot!
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• Interactive quizes/surveys
• From the web browser
• Visit the page
kahoot.it
and provide
• PIN number
• Your nick

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Let’s get familiar with
the Kahoot by a quick
4 questions warm up
Kahoot warmup!

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For 3 winners a special
prize is ready, so take
part in the trivia quiz
Trivia

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What’s next
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• Feedback:
– Contact your organizer Patryk Bandurski via e-mail or LinkedIn profile to suggest
topics
– Contact MuleSoft at meetup@mulesoft.com for ways to improve the program
• Our next meetup:
– Date: Q1 2020
– Topic: not known yet

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What’s next
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Invite your network to join
– https://meetups.mulesoft.com/warsaw/

41. Group photo
Time to do the photo!

42. See you next time